Speed Maths Test Worksheet

Speed calculation lesson 15: Mixed speed challenge · Set 543 · 40 questions

The fast method (Spot the trick): A 7, 8 or 9 in the ones place → round and fix. × 4, 8, 5, 50 or 15 → doubling or halving tricks. ÷ 5, 25 or 50 → double first. A percentage → start from 10%. Checking or estimating → nines or rounding.

1. 1.Best estimate of 38 × 48? (a) 200 (b) 2000 (c) 20000 (d) 4000
2. 2.Best estimate of 41 × 28? (a) 12000 (b) 1200 (c) 2400 (d) 120
3. 3.49 × 50 =
4. 4.61² =
5. 5.79² =
6. 6.59 + 23 + 36 + 23 =
7. 7.146 × 4 =
8. 8.589 − 89 =
9. 9.16 + 24 + 73 + 76 =
10. 10.93 − 16 =
11. 11.Best estimate of 202 × 7? (a) 14000 (b) 2800 (c) 1400 (d) 140
12. 12.7 + 3 + 6 + 9 + 3 =
13. 13.31² =
14. 14.8 + 9 + 1 + 4 =
15. 15.Best estimate of 602 × 9? (a) 540 (b) 54000 (c) 10800 (d) 5400
16. 16.7 × 15 =
17. 17.Check with nines: 758 + 452 = 1212. Correct or wrong? (a) correct (b) wrong
18. 18.Check with nines: 601 + 990 = 1591. Correct or wrong? (a) correct (b) wrong
19. 19.18 × 16 =
20. 20.370 − 19 =
21. 21.55 + 86 + 61 + 14 =
22. 22.3 + 1 + 1 + 9 =
23. 23.338 − 36 =
24. 24.24 × 5 =
25. 25.87 + 23 + 78 + 15 =
26. 26.80 + 20 + 16 + 55 =
27. 27.31 × 15 =
28. 28.15 + 38 + 33 + 43 =
29. 29.83 + 23 + 37 + 48 =
30. 30.10% of 280 =
31. 31.477 − 97 =
32. 32.360 ÷ 5 =
33. 33.56 × 50 =
34. 34.478 + 88 =
35. 35.Best estimate of 81 × 19? (a) 1600 (b) 16000 (c) 160 (d) 3200
36. 36.212 − 19 =
37. 37.459 − 88 =
38. 38.Best estimate of 49 × 18? (a) 10000 (b) 100 (c) 2000 (d) 1000
39. 39.354 − 49 =
40. 40.28 × 50 =

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